A jab is a type of punch used in the martial arts. Several variations of the jab exist, but every jab shares these characteristics: while in a fighting stance, the lead fist is thrown straight ahead and the arm is fully extended. It is an overhand punch; at the moment of impact, the pronated fist is generally held in a horizontal orientation with the palm facing the ground.

A jab is an integral part of a fighter's defense. Its speed and power of execution and reach can keep the opponent at a distance, preventing him from charging in. Defensive jabs can be employed while moving backwards.

This jab gives a fighter high mobility and is often used with the intention of scoring points. Fighters use this variation of the jab when they want to preserve the mobility and balance of their stance.

Used in order to establish a feeling for distance, the rangefinding jab is often used to set up a power punch with the other hand. Thus it can help conserve stamina and lower the risk of being countered by allowing the fighter to commit his stronger hand only when he is within proper range.

Power can be added to a jab if it is thrown with a moderate step forward. The drawback to this technique is that it takes the fighter out of his boxing stance, committing him to the punch rather more than the speed jab. A "pivot jab" is the most powerful jab, one in which the weight shifts almost entirely to the lead foot, which pivots to put the mass of the body behind the punch. Jabbing from the hip, rather than from a tight guard, will add power to the jab at the expense of speed.[3]

Jabbing to the body is relatively uncommon, because it increases a fighter's vulnerability to a counterpunch. Typically, the fighter bends at the waist and fires a speed jab to the midsection of his opponent in an attempt at getting the opponent to drop his guard. It is impractical to put the body weight behind this punch, so power is limited. The jab to the body can be used effectively to counter the opponents lead jab.